chore(deps): update dependency phpstan/phpstan to ^1.12.8

Author: hywax-assistant

composer.json

@@ -23,7 +23,7 @@
     "guzzlehttp/guzzle": "^7.9.2"
   },
   "require-dev": {
-    "phpstan/phpstan": "^1.12.7",
+    "phpstan/phpstan": "^1.12.8",
     "squizlabs/php_codesniffer": "^3.10.3"
   },
   "autoload": {